? Mom appt next tues EARLY, skip amps??

The only time ortho can see mom is 730am. That means leaving home at 7am. I can't do Myagi shot at 650 or so an hour early because he likes to check the fishes in the am and no guarantee he'll eat. Ortho appts take long - 730 check in for 8am appt, then cut off current splint, wait etc, doc, new cast etc etc. So I think it'll be better to skip that shot because if I shoot late it could be 11am or even later when we do get back.
And if we skip, his pm dose would be same or does anyone recommend a fat dose or increase? And please don't yell at me for asking, I'm just covering all bases. Upset about this anyway.
Fyi/btw The only way to guarantee he'd eat enough to carry him through would be kibble.
Please advise - thanks